/*
包含n个reducer函数的模块
 */
import {INCREMENT, DECREMENT} from './action-types'

export function counter(state = 0, action) {

  console.log('counter()', state, action)
  switch (action.type) {
    case INCREMENT:
      return state + action.data
    case DECREMENT:
      return state - action.data
    default:
      return state
  }
}
